content/common/input/touch_event_stream_validator.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_COMMON_INPUT_TOUCH_EVENT_STREAM_VALIDATOR
   6 #define CONTENT_COMMON_INPUT_TOUCH_EVENT_STREAM_VALIDATOR
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "third_party/WebKit/public/web/WebInputEvent.h"
  12
  13 namespace content {
  14
  15 // Utility class for validating a stream of WebTouchEvents.
  16 class TouchEventStreamValidator {
  17  public:
  18   TouchEventStreamValidator();
  19   ~TouchEventStreamValidator();
  20
  21   // If |event| is valid for the current stream, returns true.
  22   // Otherwise, returns false with a corresponding error message.
  23   bool Validate(const blink::WebTouchEvent& event, std::string* error_msg);
  24
  25  private:
  26   blink::WebTouchEvent previous_event_;
  27
  28   DISALLOW_COPY_AND_ASSIGN(TouchEventStreamValidator);
  29 };
  30
  31 }  // namespace content
  32
  33 #endif  // CONTENT_COMMON_INPUT_TOUCH_EVENT_STREAM_VALIDATOR